Crankshaft grinders PM 310 PM 320
For decades NAXOSUNION crankshaft grinders held a prominent place in the worldwide manufacture of engine components for passenger and commercial vehicles. By now their combination of CBN technology and the pin chasing process has become the accepted industry standard. NAXOS-UNION was the first to apply linear motor technology to the process and now offers highly dynamic drive systems to satisfy production requirements.
P M P M
2
3 1 0 3 2 0
CRA N KSH A FT G R IND E R
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Series PM 310 / 320.
The machine design meets the modern production environment‘s increased
•• X-axis drive system with antibacklash linear motor
demands for a high degree of availability,
•• Work head with torque motor
a small footprint, simple and time-saving
•• Hydro-static guideways (X- and
installation and commissioning and easy
Z-axis)
servicing.
•• Adaptive in-process gauging system
Special features:
•• Grinding spindle with direct drive
•• CBN technology also for the grinding of radii and shoulders •• Pin chasing of the bearings, with the workpiece centrically clamped •• The twin-head version offers the highest productivity levels through
(55 kW / 97 kW) •• Machine enclosure detached from machine •• Compact design •• Integrated roundness monitoring and error correction
simultaneous machining with independently working grinding units
P M P M
3 1 0 3 2 0
Twin-head pin grinder for pre-grinding into solid material using an electro-plated CBN wheel.
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Grinding the pin bearings on a heavy truck crankshaft.
CBN main bearing grinder.
Flexible CBN grinder with B-axis.
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Machine variants and grinding technologies.
The modular system allows the
machines, following the traditional
configuration of a multitude of machine
concept, the decision depends on
variants. The main and pin bearings
production requirements.
can be machined in a single setup on the same grinder or on two different Single, straight wheel head: Two straight wheel heads: Pivoting wheel head: Angular wheel head: Available grinding technologies:
P M P M
3 1 0 3 2 0
RF angular plunge cut.
PMD 320 twin-head machine for simultaneous grinding.
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grinding the main and/or pin bearings simultaneous grinding of the main and/or pin bearings combined processes, grinding consecutively grinding the high and low ends pre-grinding with electro-plated and finish-grinding with vitrified-bonded CBN grinding wheels; straight plunge grinding of bearing seats with/without shoulders and radii; multiple plunge grinding (bearing width > wheel width); diagonal and kiss grinding; flexible grinding (wheel edge radius < bearing radius); angular plunge grinding with CBN or corundum wheels.
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Technical Data.
Capacity
PM 310
PM 320
Workpiece length, max.
mm
1,000
1,800
Workpiece weight, max.
kg
80
250
in
39.5
71
lb
176
Swing diameter, max.*
mm
300
320
Stroke radius, max.*
mm
110
110 / 140
Grinding center above the bottom edge of machine
mm
1,100
1,300
Wheel diameter*
mm
650
650
Max. wheel width*
mm
50
50 / 60
Cutting speed, max. Coolant
m/s
in in in
12
4.5
43.5
550 12
4.5 / 5.5 51
Grinding wheels in in
25.5 2.0
25.5
2.0 / 2.5
125 (200) 125 (200) emulsion or grinding oil
Drives X-axis Feed force X Rapid-traverse rate X / Z
Nm
ft-lb
m/min
SIEMENS linear motor 5,100 5,100 3,762
3,762
25 / 20
25 / 25
ipm
984 / 787
984 / 984
Length a
mm
5,800
7,300
Width b
mm
3,800
4,140
Height c
mm
2,810
3,010
Weight of single-wheel machine
kg
17,000
21,000
Weight of twin-head machine
kg
20,500
25,500
Control system SIEMENS SINUMERIK 840 D solution line Dimensions and weights
*
8
in in
in
lb
lb
228.5 149.5 110.5
37,479
45,195
It is also necessary to have individual checks, taking account of workpiece geometry and aspects of back rest and oscillation
287.4 163
118.5
46,297 56,218
Floor plan PM 310 / 320
Subject to technical changes
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